Saw them at OU here... they were pretty bad. I can't remember who was on LP's tour, but I remember a few bands on there caught my eye...

The rumored bands I've been hearing are as follows...
Linkin Park (obviously)
My Chemical Romance
Taking Back Sunday
HIM
Mindless Self Indulgence
Placebo
Saosin
All of these bands were confirmed by Joe via a radio interview. Some other rumored ones are...
The Bled
Billy Talent
Mastadon
and now, Madina Lake